RDA How NOT to build on RDA ?

[antonmichal]

Alright guys - there are more than enough forums, youtube videos and guides out there on the internet on how to build your coils, RDAs, mods etc
All of this is cool and very useful as everyone is advising on how to do things properly BUT for someone like myself it would be very useful to know what
NOT to do when using mechanical MODS or building first rda .

Examples :
everyone is like "make sure your battery is compatible" and "make sure to check your ohms before first fire", etc
... cool guys , but what exactly am i checking for ?? i mean - making sure i don't have a short is quite straight forward, but say
i'm gonna build my first coil and it reads 0.5 ohm and i'm planning to use it on my 18650 battery ... so is 0.5 ohm good or bad ? is it "safe" ?
i bet you'll probably say - depends what you are after....


So can someone please mention things that should NOT be done when using MODS / RDAs especially from safety point of view ?
Like a list of complete "NO-GOs" for beginners.

THANKS

 

[State O' Flux]

Alright guys -
i'm gonna build my first coil and it reads 0.5 ohm and i'm planning to use it on my 18650 battery ... so is 0.5 ohm good or bad ? is it "safe" ?

Welcome to ECF, Michael...

It's basic Ohm's law math formulas... i.e. resistance to current ouput 'parity'. Volts divided by resisstance equals required minimum current, or V ÷ Ω = A.

Where Volts is a fully charged 18XXX battery at 4.2v, and resistance is 0.5Ω... the required minimum Continuous Current Discharge (CCD) is 8.4 amps. You can have more than that... which is preferable, but having less isn't a good thing.

Click on both my sigline hyperlinks... and read. Cheers.

 

[Frenchfry1942]

Yes, lots of reading. But it makes for a more enjoyable. and safe, hobby.

 

[antonmichal]

AHA now we are getting somewhere ! So 8.4 amps is the minimum ?? this is probably the most useful info i had in weeks

thanks !!

 

[Joe13]

Please DO NOT ignore all of the excellent advice here!

A majority of the advice contained herein may be phrased as positive statements, but that doesn't mean you're only getting half of the story.

If you can't deduce whether a .5 ohm load is safe or not on your particular battery, I think you have more reading to do. It DOES NOT "depend what you are after"... FYI, a .5 ohm load will pull 8.4 amps from a fully-charged battery. Is your battery rated to handle that? If it's not, then it's unsafe.

 

[jaxgator]

You also need to know your battery's C rating or maximum continuous discharge rate and don't exceed (preferably, keep it at or under 80%) that with your builds.

 

[Joe13]

You also need to know your battery's C rating or maximum continuous discharge rate and don't exceed (preferably, keep it at or under 80%) that with your builds.

I think Jax wins this thread, for providing solid advice using the contracted form of "DO NOT".

 

[antonmichal]

@Joe13 - at no point i disregard any advice that i get. But i also want to make sure i fully understand what i
should NOT be doing whenever i decide to start build my own and thats the reason why i've started this thread on the first place

can you guys think of anything else that should be avoided at all cost ?

 

[weaksause]

Well they've already covered what you really ought to do to be aware of before you click the firing click of your mechanic mod
That is do not fire it up without first measuring your builds resistance, then calculating the amp required from your battery, E.g. You built a coil you measure on your ohm box (best, cheapest way for noob) and it says .10 ohms, 4.2v / .10 = 42 amperes. That build shouldn't be used on the standard 18650 battery's, it would be okay to use on , e.g. Efest purple 26650 which is rated to be 64 amperes. V / R = I that is the voltage your battery has across it, divided by the resistance your coil is gives you the current produced by those two things, if your battery produces a current it isn't capable of handling, it's dangerous.
Read about Wikipedia ohms law
This may help
Resistors - Ohms Law Quiz

Now don't dry burn the rba with wicking (silica can be dry burned I think? But most they'll melt and or burn).
Don't try to vape anything but e juice, e.g. Pg VG nicotine and approved (by other threads in e juice forum) flavoring, or ready made e juice with your rba.
Don't try to get ....ed up on a high nicotine juice and low ohm build
???? That's really all I got

 

[jaxgator]

@Joe13 - at no point i disregard any advice that i get. But i also want to make sure i fully understand what i
should NOT be doing whenever i decide to start build my own and thats the reason why i've started this thread on the first place

can you guys think of anything else that should be avoided at all cost ?

Yeah, Suicide Bunny's Madrina.

Seriously though. My friend, the best way is to educate yourself. This forum is chock full of information and is how I and many many others learned.

Here's some blogs by our resident battery expert to get you started:

(7) Information Resources for Your First RBA

(9) Battery Basics for Mods: IMR or Protected ICR?

(12) Deeper Understanding of Mod Batteries - Part I

(11) Deeper Understanding of Mod Batteries - Part II

(14) Ohm's Law for Dummies (Vapers)

(16) Explain it for the dumb noob: Ohm's Law calculations

I suggest you read through each of them thoroughly and then post any question you might have.

 

[Joe13]

DON'T leave a mech mod unlocked, especially if you have kids or pets around.

DON'T trust springs or magnets, when there's the possibility of a fire if they should fail.

Aside from a locking mechanism, a mech mod has essentially zero safety features. They can be used safely to fire sub-ohm loads and produce delicious clouds of vapor, but so can the newer regulated high-power mods. DON'T disregard these units with built-in safety features.

(Full disclosure: I regularly sub-ohm on mechs. But I know my batteries, I know my coil builds, and I know my physics.)

 

[Ace64]

It took me long time to learn how to build effectively and create something i liked. I read much and watched many videos. Here is my two cents...
I didnt like wrapping on a drill bit. the cotton does not know what you wrapped on. I like using these screwdrivers to wrap. It is easy.


Once I wrap.... this is KING:


I don't "pre-burn" wire. I burn it on the atty:


Then I check resistance again!

As far as my don'ts:
Don't do a low ohm build and use high nic.
If you build on your mech mod make sure it is locked:


YUP! That was a nice twisted. OUCH!

Good luck!

 

[antonmichal]

Guys - thanks a lot for all the info posted !! Very interesting and educational.
My current plan is to start experimenting with my first build on rdna 40 and once mastered will attempt on mechanical.

@Ace64 - AUCH !!

thanks again !

 

[Bjorhyn]

Do not get your mod wet!

Also, do not feed it after midnight.